EMRFD Message Archive 10417

Message Date From Subject
10417 2014-11-05 10:10:00 bob_ledoux Choosing R and C Values for Active Filters
Active filter theory defines an R and C combination for each pole.  We have freedom to chose a value for either R or C and have the other value computed.

 Typically, we emphasize small R values for low noise.

I'm using QuadNet to design a phase delay network for an SSB receiver. Phase delay active networks require very precise component values.  I decided to use a 20 turn 1K  trimmer to adjust the low frequency supression.  For a resistance below 1K a cap of 2uf is called for.

That is a big cap. My plan is to measure the cap within 0.1% and then calculate the resistance.

 What are the short comings of this plan?